找不到符号-方法setColor（java.awt.Color）？

我试图为变为灰度的图像创建一个新的调色板，然后将调色板应用于灰度图像。我开始使用我想用来应用调色板的方法，但是我遇到了标题中提到的错误。我已经在代码中使用了“java.awt.Color”，所以我不确定为什么会出现错误。另外，正如您将看到的，我在括号内放置了一种颜色

/**
 * This program takes an image, converts it to grayscale, and uses a color palette to create new colors for the image. 
 * 
 * @author Dylan Hubbs 
 * @version 08/02/16
 */
import java.awt.Color ;
class ColorPalette
{
    public void grayscaleEffect(Picture pictureObj)
    {
        int redValue = 0; int greenValue = 0; int blueValue = 0;
        Pixel grayscaleTargetPixel = new Pixel(pictureObj, 0,0);
        Color grayscalePixelColor = null;

        for(int y=0; y < pictureObj.getHeight(); y++)
        {
            for(int x = 0; x < pictureObj.getWidth(); x++)
            {
                grayscaleTargetPixel = pictureObj.getPixel(x,y);
                grayscalePixelColor = grayscaleTargetPixel.getColor();                    //gets the color of the target pixel
                grayscalePixelColor = new Color((grayscaleTargetPixel.getRed() + grayscaleTargetPixel.getGreen() + grayscaleTargetPixel.getBlue()) / 3, (grayscaleTargetPixel.getRed() + grayscaleTargetPixel.getGreen() + grayscaleTargetPixel.getBlue()) / 3, (grayscaleTargetPixel.getRed() + grayscaleTargetPixel.getGreen() + grayscaleTargetPixel.getBlue()) / 3);

                grayscaleTargetPixel.setColor(grayscalePixelColor);                       //sets the new color of the target pixel
            }//end of the inner for loop
        }//end of the outer for loop

        pictureObj.explore();                                           //explore the Picture object which is now the altered image
        pictureObj.write("grayscaleWashingtonMonument.jpg");                  //write the altered Picture object to a new file
        pictureObj.show();
    }

    public void paletteEffect(Picture pictureObj)
    {
        int redValue = 0; int greenValue = 0; int blueValue = 0;
        Pixel paletteTargetPixel = new Pixel(pictureObj, 0,0);
        Color palettePixelColor = null;
        Color [] palette = {Color.RED, Color.BLUE, Color.CYAN, Color.GREEN, Color.YELLOW, Color.GRAY, Color.PINK, Color.ORANGE};
        for(int y=0; y < pictureObj.getHeight(); y++)
        {
            for(int x = 0; x < pictureObj.getWidth(); x++)
            {
                paletteTargetPixel = pictureObj.getPixel(x,y);
                palettePixelColor = paletteTargetPixel.getColor();
                if(paletteTargetPixel.getRed() >= 1 && paletteTargetPixel.getRed() <= 31)
                palettePixelColor.setColor(palette[0]);
                else if(paletteTargetPixel.getRed() >= 32 && paletteTargetPixel.getRed() <= 62)
                palettePixelColor.setColor(palette[1]);
                else if(paletteTargetPixel.retRed() >= 63 && paletteTargetPixel.getRed() <=93)
                palettePixelColor.setColor(palette[2]);
            }
        }
    }
}
public class ColorPaletteTester
{
    public static void main(String[] args)
    {
        Picture pictureObj = new Picture("washingtonmonument.jpg");     //creates a new Picture object representing the file in the parameter list                 
        pictureObj.explore();
        ColorPalette cp = new ColorPalette();

        cp.grayscaleEffect(pictureObj);
        cp.paletteEffect(pictureObj);
    }
}

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有人知道为什么会发生这种情况吗？

palettePixelColor被声明为，它恰好是一个不带设置器的不可变类。根据什么是

像素

，它可能有这样一种方法

你可能正在尝试做类似的事情

palettePixelColor = palette[0];

或

---

您可能想编写

palettePixelColor=palette[0]

我要冒险在这里说，

Color

类没有名为

setColor（）

的方法，我以前使用过setColor方法，但是将变量分配到数组的索引位置更有意义。谢谢，请包括您丢失的导入内容。例如，像素、图片等。是的，我想我的意思是放置目标像素。非常感谢。SOP是选择（并在获得代表后进行投票）。

palettePixelColor = palette[0];

paletteTargetPixel.setColor(palette[0]);